Among animals other than insects capable of caussing losses to the agriculturistm the group of Nematodes or Round worms is of no mean importance. Besides including numerous forms capable of causing diseases in livestock. The group contains several species known to be seriously destructive to plants of economic importance Few among then can, however .claim that from rank in notoriety which the Rock-knot Eelworm--Hederodera radicicola Muller justify occupies by reason firstly of the world-wide distribution in enjoys being present in tropic and temperate climmes alike.and secondly ,of the cosmopolitan tastes in having one of the widest known range of food plants.
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